The number itself.
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The highest factor of any number is the number itself.
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There is no highest number, highest prime number, or highest composite number. Therefore, there can't be a second-highest, third-highest, etc., of any of these types of numbers, either.
The highest common factor of 2 and 4 is 2. The number 2 is a factor of 4.
The greatest common factor is the highest number that can be divided equally into two or more numbers.